Which later astronomer attempted to map the distribution of Milky Way stars but was limited by an uncorrected factor?

Answer

William Herschel

Thinkers like William Herschel later attempted to map the distribution of these stars to determine the Sun's location, though even his models were limited by not accounting for interstellar dust obscuring the view.

Which later astronomer attempted to map the distribution of Milky Way stars but was limited by an uncorrected factor?
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